England: 1904 Early types of John Ambrose Fleming's two electrode valve, which was the first vacuum tube.

England: 1904 Early types of John Ambrose Fleming's two electrode valve, which was the first vacuum tube.
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DETAILS
Image Number: 1035-12810Rights ManagedCredit Line:Underwood Photo Archives/SuperStockCollection:Underwood Photo ArchivesModel Release:NoProperty Release:NoResolution:4800×3528
1900s
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1904|
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